This question already has an answer here:
Is it possible to format an HTML tooltip?
E.g. I have a DIV with attribute title="foo!". When I have text-size of my browser zoomed in or out in, the text size of the tooltip remains unchanged. Is there a way to make the tooltip font scale with the browser setting?
Try using entity codes such as

for CR,

for LF, and	
for TAB.For example:
In bootstrap tooltip just use data-html="true"
No. But there are other options out there like Overlib, and jQuery that allow you this freedom.
Personally, I would suggest jQuery as the route to take. It's typically very unobtrusive, and requires no additional setup in the markup of your site (with the exception of adding the jquery script tag in your <head>).
it seems you can use css and a trick (no javascript) for doing it:
http://davidwalsh.name/css-tooltips
http://www.menucool.com/tooltip/css-tooltip
http://sixrevisions.com/css/css-only-tooltips/
http://csstooltip.com
Better late than never, they always say.
Normally I'd use jQuery to solve such a situation. However, when working on a site for a client which required a javascript-less solution, I came up with the following:
By using the following css, you get the same situation as with a title:
This gives you the option to style it according to your needs as well, and it works in all browsers. Even the ones where javascript is disabled.
Pros:
Cons: